The scientist credited with discovering that electric currents produce magnetic fields was
A. Tesla.
B. Coulomb.
C. Faraday.
D. Oersted.
E. Ampere.
Answer: D
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A large electromagnet has a 22 T magnetic field between its poles. What is the magnetic energy density in that region of space? (?0 = 4? × 10-7 T ? m/
A) A) 30,000 J/cm3 B) 190 J/cm3 C) 88 J/cm3 D) 240 J/cm3
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Jane's flashy boy friend has just given her a ring with a huge "diamond". Jane, who has studied physics, measures the polarizing angle for the stone and finds that the polarizing angle is 62.97°. The stone is
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